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Annotation of 43BSDTahoe/lib/libc/gen/readdir.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)readdir.c  5.4 (Berkeley) 6/18/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/param.h>
        !            23: #include <sys/dir.h>
        !            24: 
        !            25: /*
        !            26:  * get next entry in a directory.
        !            27:  */
        !            28: struct direct *
        !            29: readdir(dirp)
        !            30:        register DIR *dirp;
        !            31: {
        !            32:        register struct direct *dp;
        !            33: 
        !            34:        for (;;) {
        !            35:                if (dirp->dd_loc == 0) {
        !            36:                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, 
        !            37:                            DIRBLKSIZ);
        !            38:                        if (dirp->dd_size <= 0)
        !            39:                                return NULL;
        !            40:                }
        !            41:                if (dirp->dd_loc >= dirp->dd_size) {
        !            42:                        dirp->dd_loc = 0;
        !            43:                        continue;
        !            44:                }
        !            45:                dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc);
        !            46:                if ((int)dp & 03)       /* bogus pointer check */
        !            47:                        return NULL;
        !            48:                if (dp->d_reclen <= 0 ||
        !            49:                    dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc)
        !            50:                        return NULL;
        !            51:                dirp->dd_loc += dp->d_reclen;
        !            52:                if (dp->d_ino == 0)
        !            53:                        continue;
        !            54:                return (dp);
        !            55:        }
        !            56: }

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